[size="5"]PROBLEM:[/size]
Steam does not allow running (altered) game .exe which is not in the game library. The error message is
[i]"This game is currently unavailable. Please try again at another time."[/i]
[size="5"]SOLUTION:[/size]
In windows, go to the game folder (directory),
...\Steam\steamapps\common\name_of_game\...\game_name.exe
(1) Change "game_name" to "new_game_name"
(2) In the Steam panel,
[Games] -> [Add a Non-Steam Game to My Library ...]
[Browse...]
Go to location of "new_game_name" --> [Open]
[Add Selected Programs]
(3) new_game_name will now be shown in your steam game library.
(4) Start new_game_name from your steam game library ([u]not[/u] from windows file manager)
No more steam error message. Happy Gaming!

Nice idea. I'll try this tonight on Shift 2 Unleashed. It might be worth posting in the Deus Ex thread as well - the solution using mklink is described there, but some might find this preferable (especially as it adds it to the Steam UI).

Nice idea. I'll try this tonight on Shift 2 Unleashed. It might be worth posting in the Deus Ex thread as well - the solution using mklink is described there, but some might find this preferable (especially as it adds it to the Steam UI).